Baitaihem Red Light Visual Fault Locator 10mW 12KM BML-205-10 Fiber Optic Cable Tester Meter 2.5mm universal connector, operates either in CW or Pulsed, constant output power Constant output power, lower Battery warning, Long battery life (up to 60 hours) Portable and rugged, easy to use, 2.5mm universal connector Laser case ground design prevents ESD damage Crash-proof and dust-proof design for laser head